Added inb and outb functions

src/pio.S

@@ -0,0 +1,13 @@
+.global outb
+outb:
+    mov 4(%esp), %dx
+    mov 8(%esp), %al
+    out %al, %dx
+    ret
+
+.global inb
+inb:
+    mov 4(%esp), %dx
+    xor %eax, %eax
+    in %dx, %al
+    ret

src/pio.hpp

@@ -0,0 +1,8 @@
+#ifndef PIO_H
+#define PIO_H
+
+extern "C" void outb(short port, char data);
+
+extern "C" char inb(short port);
+
+#endif